Bulgaria Bulgaria and Romania finalize the process of joining the Schengen Area and lift their land border controls.
FBI FBI agents announce the seizure of more than 150 homemade pipe bombs and other explosive devices from a home in Isle of Wight County, Virginia, United States, "the largest seizure by number of finished explosive devices in FBI history".
Mass shooting Eleven people are injured during a mass shooting outside a nightclub in Queens, New York, United States.
Police officer A police officer is killed and four other people are injured in a vehicle-ramming attack during a patrol in Nelson, New Zealand. A 32-year-old suspect is arrested.
Myanmar Myanmar's Tatmadaw enacts a cybersecurity law imposing strict controls on digital communications, requiring service providers to store user data for three years, penalizing VPN use without government approval, and allowing authorities to block or shut down platforms deemed to spread disinformation or disrupt stability.
Familicide Five people are killed in a familicide mass stabbing when a son kills his four sisters and mother in Lucknow, Uttar Pradesh, India.
2025 Las Vegas Trump Hotel bombing A Tesla Cybertruck containing firework mortars and gas canisters explodes outside the Trump International Hotel Las Vegas in Paradise, Nevada, United States, injuring seven people. The driver died from a self-inflicted gunshot prior to the explosion. The Federal Bureau of Investigation (FBI) is currently investigating the incident as a possible terrorist attack.
Capital punishment in Saudi Arabia Saudi Arabia announces the execution of six Iranian nationals convicted of smuggling hashish. In Tehran, the Iranian Foreign Ministry summoned the Saudi ambassador in protest.
Al Jazeera controversies and criticism The Palestinian Authority suspends Al Jazeera's broadcasts and operations in Palestine, accusing the network of interfering in internal affairs and spreading incitement and misinformation.
2025 Cetinje shootings Twelve people are killed and four others are injured in a shooting spree in Cetinje, Montenegro. The perpetrator kills himself.
2024–2025 German New Year's Eve pyrotechnics incidents Five people are killed, several others are injured, and at least 330 people are arrested due to mishandling of pyrotechnics during New Year's celebrations in Germany.
Honduras–United States relations Honduran President Xiomara Castro warns that she might remove all US military bases from Honduras and seek to cancel the military cooperation with the United States if President-elect Donald Trump fulfills his threat to order mass deportations of Hondurans when he takes office next January 20.
Honolulu Three people are killed and over twenty others are injured in a fireworks explosion at a house in Honolulu, Hawaii, United States.
European migrant crisis Twenty-seven migrants from sub-Saharan Africa are killed, and 83 others are rescued after two boats capsize off the Kerkennah Islands near Tunisia, with searches ongoing for additional missing passengers.
Moldova–Russia relations As announced, Russia's Gazprom halts its gas supplies both to Moldova and the self-proclaimed Transnistrian republic alleging non-compliance with payment obligations.
Foreign relations of Mexico Mexico's Tax Administration Service implements new tariffs, including a 19% duty on goods from countries without international trade agreements with Mexico and a 17% duty on goods from Canada and the United States under certain value thresholds.
2022–2023 Russia–European Union gas dispute Russia's gas firm Gazprom suspends exports of Russian natural gas through Ukrainian pipelines after Ukraine refused to renew the transit agreement between its operator Naftogaz and Gazprom. However, Hungary will continue receiving Russian natural gas via the TurkStream pipeline.
Public Domain Day The novel "A Farewell to Arms" and the cartoon characters Popeye and Tintin enter the public domain in the United States.
Somali Civil War The African Union Support and Stabilisation Mission, endorsed by United Nations Security Council on December 27, replaces the African Union Transition Mission as the African Union's peacekeeping mission in Somalia.
2025 New Orleans truck attack A man kills 14 people and injures 35 others, including two police officers, in a vehicle-ramming and shooting attack on Bourbon Street in New Orleans, Louisiana, United States, before being shot dead. The FBI says that it found an Islamic State flag in the suspect's vehicle.
Israel–Hamas war Israeli airstrikes across the Gaza Strip kill at least 26 Palestinians, including four children. At least ten others are missing and believed to be buried under rubble.